Larkspur, Candle Delphinium
Delphinium 'Black Knight'

Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Delphinium (del-FIN-ee-um) (Info)
Cultivar: Black Knight
Additional cultivar information:(Pacific Giant Series, aka Pacific Giant Black Knight)

Category:

Perennials

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us

Height:

36-48 in. (90-120 cm)

Spacing:

18-24 in. (45-60 cm)

Hardiness:

USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:

Full Sun

Danger:

All parts of plant are poisonous if ingested

Bloom Color:

Pink

Blue-Violet

Violet/Lavender

White/Near White

Bloom Time:

Mid Summer

Mid Fall

Foliage:

Herbaceous

Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

By dividing the rootball

From herbaceous stem cuttings

Allow cut surface to callous over before planting

By air layering

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Seed does not store well; sow as soon as possible

Regional

This plant has been said to grow in the following regions:

Cambridge, Massachusetts

Shrewsbury, Massachusetts

Albion, Pennsylvania

Johnsonburg, Pennsylvania

Murfreesboro, Tennessee

Kalama, Washington

show all

Gardeners' Notes:

4
positives
0
neutrals
0
negatives
RatingContent
Positive

On Jun 27, 2014, Jay11 from Cambridge, MA wrote:

I grew from seed the strain "Tall Black Knight" (Thompson & Morgan). Although germination is a bit of trouble because of cold stratification, I was pleased with results. From 1 packet of seeds, six plants survived. I probably could have a much better yield if I had put in a bit more effort. Most plants have dark purple flowers as expected, but one is lavender - gray in color. I planted them in the garden late last spring and they flowered in the fall. Now flowering in the second year, in June. I am pleased with how long the flowers have lasted, nearly a month. Perhaps this is due to the cool wet spring this year. I will be interested to see if they return next year.

Positive

On May 31, 2012, Jolanda40 from Amsterdam
Netherlands wrote:

Two years ago I got a garden and I wanted Delphinium to be in it so much. I've read that it's not an easy plant in most gardens and I can confirm that by now.
Complicating factor: my goal is to raise everything from seed.
Fresh Delphiunium seed germinates rather easily, but gets also easily prone te mildew or just stops growing.
And for the seedlings who make it and are planted out: all slugs in your garden are just waiting for this plant.They ignore even hostas when a fresh delphinium is around.
But I succeeded. My experience is:
Sowing:
They love a cold period. I use the "deno" method but put them in my refrigerator for at least six weeks in their wet coffee-filters. There the healthy seeds will sprout and after that I put them in their cells.<... read more

Positive

On Mar 8, 2012, lindypuddin from stony mountain, MB (Zone 3a) wrote:

planted 2010 zone 3a
the 'black knight' has the black bee

reached 7 feet tall
required fertilizing
needed support
visited by hummingbirds

Positive

On Mar 27, 2005, lmelling from Ithaca, NY (Zone 5b) wrote:

Beautiful and impressive delphinium from the "Pacific Giant" line. Deep blue with a black eye. Mature blooms can be harvested and dried for use in fall arrangements and add a particularly colorful touch (air dry upsidedown).

Plants are generally short-lived, needing to be replaced about every 3 years - but well worth it.. If first flush blossoms are harvested, the plant will rebloom.